Improvement in grinding-mills



G. SELSER.

Grinding Mill.

Patented March 29, 1859,

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UNITED STATES PATENT OFFICE.

GEORGE SELSER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIM- SELF ANDJ. COOK AND W. COOK, OF SAME PLACE.

iMPROVEM ENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 23,431, dated March 29,1859.

To aZZ whom it may concern.-

Be it known that I, GEORGE SELSER, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented certain new anduseful Improvements in Grinding-Mills; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon.

My invention consists in a peculiar mode, described hereinafter, ofsecuring the hollow steel burr of a grinding-mill to the spindle, sothat the said burr may be readily removed and replaced; and myinventionfurther consists in devices, fully explained hereinafter, whereby thedistance of the burr from the shell may be regulated at pleasure.

In order to enable others to make and use my invention, I will nowproceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of thisspecification, Figure 1 is a sectional elevation of my improvement asapplied to a coffee-mill; Fig. 2, an enlarged sectional View of thegrinding part of the mill; Fig. 3, a detached View of the burr; Fig. 4,a plan View of the same; Fig. 5, a detached sectional view of the shell;Fig. 0, a plan view of the same.

Similar letters refer to similar parts throughout the several views.

A is a box containing a drawer for receiving the ground materials. Tothe top of the box is secured a stand 0, in the upper end of which turnsthe hollow spindle D, the burr E being secured to the lower end of thisspindle, in the manner described hereinafter. F is the shell of themill, secured between the under side of the stand 0 and the cross-bar Gby means of screws to a, the lower end of the rod H, which passesthrough the interior of the hollow spindle, being secured to thiscross-bar. The burr and shell are made of hardened steel by a processunnecessary to describe here, as being foreign to the presentapplication. In order to attach the hardened steel burr to the spindle,a shoulder is formed at 6, near the lower end of the spindle D, and

a screw is formed at the extreme end. A plate I is fitted snugly to theinterior of the steel burr, and into the plate is screwed the end of thehollow spindle until the shoulder e bears tight against the top of theburr, when the latter will be as firmly secured to the spindle as thoughit formed a part thereof.

M is the arm for turning the burr, having at one end the usual handle onand at the opposite end a hub 92, which is screwed tight into the top ofthe hollow spindle D. The top of the hub 11 of the arm is closed, withthe exception of an opening for admitting the thumb -screw q, the pointof which bears upon the end of the rod H in the interior of the hollowspindle D, so that on turning the thumb screw in one direction thehollow spindle with its steel burr will be raised and the teeth of thelatter brought nearer to those of the shell, and on turning the screw inthe opposite direction the spindle and burr will be lowered, thusallowing the mill to be readily regulated to grind the material eithercoarse or fine.

N is a cup for containing the material to be ground, the latter passingthrough an opening in the bottom of the cup into. the space between theshell and the burr.

It will be seen that both the shell and burr may be readily detachedfrom their fastenings when their teeth are worn or broken, and that theymay be as readily replaced by new ones.

I claim and desire to secure by Letters Patent- Attaching the hollowsteel burr to the spindle D by screwing or otherwise securing the end ofthe latter to a plate I, which is fitted snugly to the inside of theburr, a shoulder e on the spindle bearing on the top of the burr, asherein set forth.

I testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE SELSER. Witnesses:

HENRY I-IowsoN, HORACE SEE.

